Audio Database
RX-400A
Commentary

Stereo receiver with built-in 4 ch speaker matrix.

The FM front-end uses a three link varicon and a high-sensitivity low-noise FET.
It also uses a 6-stage amplifying IF circuit and ceramic filter.

Uses SEPP output circuit.

Model Rating
Type FM/AM stereo receiver
<Audio section>
Music Power (IHF) 80W (4 Ω)
60W (8 Ω)
Effective power Single-channel Drive : 20W/20W (8 Ω)
Double-channel drive : 17W + 17W (8 Ω)
Harmonic distortion factor (1 kHz) 0.3% (at 15W output)
0.2% (at 1W output)
Intermodulation distortion factor (70 hz : 7 khz = 4 : 1) 0.2% (at 15W output)
0.15% at 1W output
Frequency characteristic 15 Hz ~ 70 kHz (at 1W Output)
17 Hz ~ 55 kHz (at 20W Output)
Output band characteristic 20 Hz to 40 kHz
Damping factor 30 (8 Ω)
Signal-to-noise ratio Phono:60dB
Aux:70dB
Residual noise 1mV
Input Sensitivity / Impedance Phono : 3mV/50k Ω
Aux : 200mV/100k Ω
Tape in : 400mV/15k Ω
Tone control Bass : ± 13 dB (50 Hz)
Trebel : ± 13 dB (10 kHz)
Loudness control +10dB(50Hz)
FM Tuner Section
Antenna impedance 300 Ω balanced / 75 Ω unbalanced
Sensitivity (IHF) 2.0 μ V
Harmonic distortion factor (400 Hz, 100% modulation) mono:0.5%
stereo:1%
Signal-to-noise ratio 65 dB or more
Image interference ratio 50 dB or more
Spurious response 80dB
Intermediate frequency interference ratio 80dB
Capture ratio 3dB
Selectivity (IHF) 45dB
Separation 35 dB or More (1 kHz)
SCA suppression ratio 60dB
AM suppression ratio 40dB
Stereo mono auto level 50 μ V
<AM Tuner Section>
Practical sensitivity 25 μ V (S/N = 20 db)
Image Ratio (1 mhz) 50dB
Intermediate frequency interference ratio (1 MHz) 50dB
Signal-to-noise ratio 50dB
<General>
Semiconductor used Transistor : 40
FET : 1
Diode : 21
Ceramic Filter : 1
Power consumption 140VA
External dimensions Width 435x Height 130x Depth 320 mm
Weight 7kg